Every week, in garages around the world, amateur racers spend their hard-earned day-job dollars repairing and improving all sorts of racecars, with one goal in mind - winning a tacky plastic trophy on the weekend. Now the U.S. government has honored that hallowed tradition, announcing that the robot drivers in the upcoming 2007 DARPA Grand Challenge will forgo the $2 million cash prize previously promised to the winner, in exchange for - a trophy! (Probably a mil-spec trophy that they'll pay too